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City rapid extraction method and device

An extraction method, a city technology, applied in the direction of instruments, calculations, character and pattern recognition, etc., can solve the problem of low accuracy in urban areas, and achieve the effect of solving the problem of over-extraction of cities, rapid extraction, and efficient data processing

Inactive Publication Date: 2019-01-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0005] This patent aims at the two main problems in the urban area extraction and analysis method, and proposes a rapid urban extraction method and device, which is suitable for quickly completing the extraction of urban areas from any ground objects, and completes the urban and bare soil, water bodies, and vegetation The rapid distinction of other ground objects also avoids the influence of the light overflow problem, thus solving the problem of low accuracy in extracting urban areas by existing technologies

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  • City rapid extraction method and device
  • City rapid extraction method and device

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Embodiment Construction

[0028] In order to solve the technical problem of low accuracy in extracting urban areas in the prior art, an embodiment of the present invention provides a method for rapid urban extraction. The general idea is as follows:

[0029] The present invention proposes a normalized difference city area index, which is suitable for quickly extracting urban areas from any features, completes the rapid distinction between cities and bare soil, water, vegetation and other features, and avoids light overflow The impact of the problem. This method saves a lot of time and energy when extracting cities by establishing the normalized difference city area index NDCAI, and realizes the one-time extraction of cities from all over the world. It has the advantages of "high accuracy, fast speed, and simplicity", and has strong Practicality and promotion.

[0030] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solu...

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Abstract

The patent of the present invention relates to the field of remote sensing and earth observation, and specifically relates to a method and device for quickly extracting cities. The method for quickly extracting cities disclosed in the present invention includes the following steps: determining the normalized difference vegetation index NDVI of the monitoring area; determining the normalized vegetation index NDVI of the monitoring area Normalized night light image OLSnor; calculated based on normalized difference vegetation index and normalized night light image, the normalized difference city area index NDCAI of the monitoring area is obtained; threshold method is used to calculate the normalized difference city area index of the urban area Extract to get a map of city extraction results. Therefore, the present invention solves the technical problem of low accuracy in extracting urban areas in the prior art through the constructed normalized difference urban area index NDCAI, and further realizes accurate and rapid extraction of urban areas.

Description

Technical field [0001] The invention relates to the field of remote sensing earth observation, in particular to a method and device for rapid urban extraction. Background technique [0002] Urbanization expansion has an important impact on regional economic development and the sustainable development of resources and environment. It is of great significance to grasp the dynamics of urbanization in a timely manner and rationally lay out the dynamics of urban spatial distribution, which is of great significance for future urban development planning to avoid the development gap between the east and the west. [0003] The area of ​​urban land is one of the important parameters for evaluating the level of urbanization, and its expansion type shows obvious regional differences due to the combined effects of various complex factors such as regional politics, economy, culture, and history. At present, the extraction of urban land area mainly has the following two problems: ①The extraction ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46
CPCG06V10/60
Inventor 杨晓楠田玉刚徐韵吴蔚
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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